one more update of ESP8266Audio library

Author: lyusupov

software/firmware/source/libraries/ESP8266Audio/src/AudioOutputI2S.cpp

@@ -68,6 +68,7 @@ AudioOutputI2S::AudioOutputI2S(long sampleRate, pin_size_t sck, pin_size_t data)
     doutPin = data;
     mclkPin = 0;
     use_mclk = false;
+    swap_clocks = false;
     SetGain(1.0);
 }
 #endif
@@ -176,6 +177,15 @@ bool AudioOutputI2S::SetLsbJustified(bool lsbJustified)
   return true;
 }
 
+bool AudioOutputI2S::SwapClocks(bool swap_clocks)
+{
+  if (i2sOn) {
+    return false; // Not allowed
+  }
+  this->swap_clocks = swap_clocks;
+  return true;
+}
+
 bool AudioOutputI2S::SetMclk(bool enabled){
   (void)enabled;
   #ifdef ESP32

software/firmware/source/libraries/ESP8266Audio/src/AudioOutputI2S.h

@@ -52,6 +52,7 @@ class AudioOutputI2S : public AudioOutput
     bool SetOutputModeMono(bool mono);  // Force mono output no matter the input
     bool SetLsbJustified(bool lsbJustified);  // Allow supporting non-I2S chips, e.g. PT8211 
     bool SetMclk(bool enabled);  // Enable MCLK output (if supported)
+    bool SwapClocks(bool swap_clocks);  // Swap BCLK and WCLK
 #if defined(ARDUINO_ARCH_RP2040)
     bool SetBuffers(size_t buffers = 6, size_t bufferWords = 128);
 #endif /* ARDUINO_ARCH_RP2040 */
@@ -67,6 +68,7 @@ class AudioOutputI2S : public AudioOutput
     int dma_buf_count;
     int use_apll;
     bool use_mclk;
+    bool swap_clocks;
     // We can restore the old values and free up these pins when in NoDAC mode
     uint32_t orig_bck;
     uint32_t orig_ws;